package com.shigen.demo.atguigu;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * sync和可重入锁 a打印5次之后，b打印10次，c打印15次 多条件通知
 *
 * @author shigenfu
 * @date 2022/5/22 9:55 下午
 */

class Shareresource {

  // a=1,b=2,c=3
  private int number = 1;
  private Lock lock = new ReentrantLock();
  private Condition c1 = lock.newCondition();
  private Condition c2 = lock.newCondition();
  private Condition c3 = lock.newCondition();

  public void print5() {
    try {
      lock.lock();
      // 判断
      while (number != 1) {
        c1.await();
      }
      for (int i = 0; i < 5; i++) {
        System.out.println(Thread.currentThread().getName() + " " + i);
      }
      // 通知
      number = 2;
      c2.signal();
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      lock.unlock();
    }
  }

  public void print10() {
    try {
      lock.lock();
      while (number != 2) {
        c2.await();
      }
      for (int i = 0; i < 10; i++) {
        System.out.println(Thread.currentThread().getName() + " " + i);
      }
      // 通知
      number = 3;
      c3.signal();
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      lock.unlock();
    }
  }

  public void print15() {
    try {
      lock.lock();
      while (number != 3) {
        c3.await();
      }
      for (int i = 0; i < 15; i++) {
        System.out.println(Thread.currentThread().getName() + " " + i);
      }
      // 通知
      number = 1;
      c1.signal();
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      lock.unlock();
    }
  }
}


public class SyncAndReentrantLockDemo {

  public static void main(String[] args) {
    Shareresource shareresource = new Shareresource();

    new Thread(() -> {
      for (int i = 0; i < 10; i++) {
        shareresource.print5();
      }
    }, "AAA").start();

    new Thread(() -> {
      for (int i = 0; i < 10; i++) {
        shareresource.print10();
      }
    }, "BBB").start();

    new Thread(() -> {
      for (int i = 0; i < 10; i++) {
        shareresource.print15();
      }
    }, "CCC").start();

  }
}
